55231500 has 48 divisors (see below), whose sum is σ = 160838496. Its totient is φ = 14728000.

The previous prime is 55231489. The next prime is 55231549. The reversal of 55231500 is 513255.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16911 + ... + 19910.

It is an arithmetic number, because the mean of its divisors is an integer number (3350802).

Almost surely, 2^55231500 is an apocalyptic number.

55231500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55231500 is an abundant number, since it is smaller than the sum of its proper divisors (105606996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55231500 is a wasteful number, since it uses less digits than its factorization.

55231500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36843 (or 36831 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 55231500 is about 7431.7898247999. The cubic root of 55231500 is about 380.8280649672.

Adding to 55231500 its reverse (513255), we get a palindrome (55744755).

The spelling of 55231500 in words is "fifty-five million, two hundred thirty-one thousand, five hundred".